EvlEvo8

Besides the obvious in terms of POOR welds and just general poor manufacturing, what causes an SS Manifold to crack or even just separate?

If you look at DSM's, they just hung the Turbo off the manfold and that was that. The DSM Downpipe DID however have a Flex section.

Enter the Evo VIII, the Stock turbo is hung off the very same (similar in strength atleast) Cast manifold YET has a support bracket as well. The stock downpipe does NOT use a Flex section.


If you look at the AMS Units and the Vishnu units (some of the Vishnu Turbo Kits use the AMS Manifold) they use a support backet that either holds the weight of the turbo OR prevents some shaking. My guess it keeps the unit from shaking as the Mitsu engineers put one one as their was no flex section.

I have yet to hear of an AMS manifold crack.


Look at the RnR setup, the don't use a supporyt bracket. They also use a Downpipe that ADDS a flex section. Again I have yet to hear of a RnR manifold crack except for STVBREAL which had a leak, and his did not crack so much as it came with a faulty weld which is simply a manufacturors error.


There are two Greddy turbo kits on this site with cracked manifolds. I have no Idea on the Turbo Trixx Manifold but I haven't heard anything bad from them.


I Guess my point is that the VIBRATION kills a manifold, not so much the weight of the turbo, any other inputs?



Thanks.


P.S. does the addition of a flex section hinder exhaust flow? Why do you think mistu ommited it?

Compjoc

iTrader: (21)

The constant extreme heat and cooling causing the crappy welds and material to fail.

RyanM

iTrader: (1)

If you wrap the header it should be less prone to cracking. One of the worst things that can happen is to have your shiney new header nearly red hot get doused with fresh rain...

Ted B

iTrader: (6)

Lots of hot/cold cycles coupled with the fact that it's probably made of 304 stainless when a more appropriate material would be 321 stainless.

RyanM

iTrader: (1)

321 would be great, but who makes a header with it? I haven't seen much 321SS around.

blueo4

iTrader: (11)

AMS

PeakBoost

iTrader: (6)

we do




PeakBoost manifold 321ss 8 gauge stainless steel, lifetime warranty.
scheduled for release 9/15/05.

let me know if you have any questions

wikdwhiterabbit

+1

ShaunSG

iTrader: (1)

Cast manifolds are a lot stronger than most SS tubular stuff especially the thin wall and improperly welded ones. Properly bracing tubular SS manifolds is recommended. There is a trememndous amount of weight and leverage acting on some setups, that, and the high heat in use softens it up. Take some cues from the F1 turbos... https://www.evolutionm.net/forums/sh...63&postcount=5

Alacris

Cast manifolds are much thicker and can take the heat loading better.

SS ones are usually thinner and dissipate the heat more quickly. This equates to more "up and down" temp cycles, which fatigues metal a lot.

The first post mentioned that we don't have a flex section? I haven't looked, but there has to be some sort of movable section, or the engine rocking would snap some exhaust welds pretty quick. I'll check the service manual, I'm pretty sure we at least have a knuckle or expansion pipe down there.

AC

Ted B

iTrader: (6)

The factory O2 sensor housing has a bracket that supports the turbo. Aftermarket ones (at least the ones I've seen) do not have provisions for this bracket. Using an aftermarket O2 sensor housing and a large turbo will indeed create a lot of stress on a tubular manifold.

Derek888

iTrader: (54)

can you use the stock radiator, seems like it will touch the manifold? sorry for the OT. btw check your pm.

LordEvoIX

Wow! That SS321 peakboost manifold is beautiful! What's the gains like?

Shearer

iTrader: (6)

Peakboost, those fittings are 321?

PeakBoost

iTrader: (6)

as it stands now, you can use the stock radiator with an HPC coated hardpipe we include with the manifold. but, we are working with PWR on a PeakBoost radiator that will relocate the waterneck to the opposite side of the cap.
we are trying to make sure that we cover every base with the PeakBoost GT kit, leaving no stone unturned

thanks.
we should have some #'s for you guys in the next coming weeks.
we got the HYDRA ems for our R&D car on friday, and ive been doing a bit of street tuning. surprised the hell out of me, how easy the HYDRA was to bring up an initial startup, as opposed to the other systems ive used.
the HYDRA fired and ran like a factory car, out of the box...

yes.
we used to use a 304ss forged fitting, but never on the EVO manis.
All PeakBoost manifolds are now 321ss forged.


heres some pics of the finished PeakBoost charge pipes:


let us know what you guys think.


ken


p.s. happy day off to everyone